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Geographic Information for Property, Plant and Equipment, Intangible Assets and Operating Lease Right-of-use Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property, plant and equipment, net $ 88 $ 22
Intangible assets, net 12 4
Right of use assets carrying amount 1,971  
Taiwan    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property, plant and equipment, net 88 22
Intangible assets, net 12 $ 4
Right of use assets carrying amount 1,897  
Hong Kong    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Right of use assets carrying amount $ 74